Explore the ocean's layers from the sunny surface zone to the pitch-black trenches. Learn about the abundant life around coral reefs, how different species adapted to their environment, and why life on the ocean floor depends on the layers above. Additional features include a diagram labeling each of the layers, Fast Facts, a phonetic glossary, an index, an introduction to the author, and further sources for learning.

The ocean has layers -- The surface zone -- The twilight zone -- The deep ocean -- Fast facts.